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Posted to dev@flink.apache.org by "Timo Walther (JIRA)" <ji...@apache.org> on 2014/06/24 10:37:24 UTC
[jira] [Created] (FLINK-970) Implement a first(n) operator
Timo Walther created FLINK-970:
----------------------------------
Summary: Implement a first(n) operator
Key: FLINK-970
URL: https://issues.apache.org/jira/browse/FLINK-970
Project: Flink
Issue Type: New Feature
Reporter: Timo Walther
Assignee: Timo Walther
Priority: Minor
It is only syntactic sugar, but I had many cases where I just needed the first element or the first 2 elements in a GroupReduce.
E.g. Instead of
{code:java}
.reduceGroup(new GroupReduceFunction<String, String>() {
@Override
public void reduce(Iterator<String> values, Collector<String> out) throws Exception {
out.collect(values.next());
}
})
{code}
{code:java}
.first()
{code}
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Re: [jira] [Created] (FLINK-970) Implement a first(n) operator
Posted by Ufuk Celebi <u....@fu-berlin.de>.
+1
Spark also has the more general `take(n)` operation, of which first() is a special case. it might make sense to go for `take(n)` and just have first() as a special case.
On 24 Jun 2014, at 10:37, Timo Walther (JIRA) <ji...@apache.org> wrote:
> Timo Walther created FLINK-970:
> ----------------------------------
>
> Summary: Implement a first(n) operator
> Key: FLINK-970
> URL: https://issues.apache.org/jira/browse/FLINK-970
> Project: Flink
> Issue Type: New Feature
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Minor
>
>
> It is only syntactic sugar, but I had many cases where I just needed the first element or the first 2 elements in a GroupReduce.
>
> E.g. Instead of
>
> {code:java}
> .reduceGroup(new GroupReduceFunction<String, String>() {
> @Override
> public void reduce(Iterator<String> values, Collector<String> out) throws Exception {
> out.collect(values.next());
> }
> })
> {code}
>
> {code:java}
> .first()
> {code}
>
>
>
> --
> This message was sent by Atlassian JIRA
> (v6.2#6252)